采煤沉陷对沉陷区洼地汇流范围的影响分析

采煤沉陷区的动态发展改变了河道的汇流范围,增大了暴雨洪水的随机性,不利于沉陷区洼地的防洪调蓄。本文研究现状地形与预测沉陷叠加的地形预测技术,提出一种沉陷区洼地汇流范围划分的新方法,利用ArcSWAT的集水区划分工具提取现状地形与预测地形各主要流域的洼地汇流范围。通过各沉陷区洼地不同年份（2010,2020,2030）汇流范围的比较分析发现：地表的不规则沉陷使淮南矿区附近的河道汇流格局发生显著变化,甚至导致不同流域的兼并。洼地汇流范围的定量分析可为沉陷区洼地的防洪除涝、水量调蓄、非点源污染分析提供必要基础和重要依据。

Analysis of Influence of Coal Mining Subsidence on Subsidence Area Depression Land Confluence Scope

The dynamic development of coal mining subsidence area changed the confluence scope of the river and increased the randomness of storm flood, which is not conductive to flood regulation and storage in subsidence area depression land. The paper studies the development of terrain forecasting techniques overlaying current topography and prediction subsidence. A new method of confluence scope division in subsidence area depression land is proposed. AreSWAT catchment division tool is adopted to extract existing terrain and predicate depression confluence scope of main water areas in the terrain. It is discovered through comparative analysis of confluence scopes in different years （2010, 2020 and 2030） at various subsidence area depression lands that irregular ground surface subsidence significantly changes the river confluence patterns near Huainan mining area , thereby leading to combination of different river areas. Quantitative analysis of depression confluence scope can provide necessary foundation and an important basis for analyzing flood, control, water-logging elimination, water quantity storage and non-point source pollution in subsidence depression lands.